Clean-up
[u/mrichter/AliRoot.git] / EVGEN / AliGenExtFile.cxx
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4c039060 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
25454878 16/* $Id$ */
675e9664 17
a48e3376 18// Event generator that using an instance of type AliGenReader
25454878 19// reads particles from a file and applies cuts.
20// Example: In your Config.C you can include the following lines
4f23c932 21// AliGenExtFile *gener = new AliGenExtFile(-1);
25454878 22// gener->SetMomentumRange(0,999);
23// gener->SetPhiRange(-180.,180.);
24// gener->SetThetaRange(0,180);
25// gener->SetYRange(-999,999);
26// AliGenReaderTreeK * reader = new AliGenReaderTreeK();
27// reader->SetFileName("myFileWithTreeK.root");
28// gener->SetReader(reader);
29// gener->Init();
30
675e9664 31
159ec319 32#include <Riostream.h>
084c1b4a 33
693caace 34#include "AliGenExtFile.h"
4f23c932 35#include "AliRunLoader.h"
9ad9d6f5 36#include "AliHeader.h"
aa4e331d 37#include "AliStack.h"
9ad9d6f5 38#include "AliGenEventHeader.h"
4a33c50d 39#include "AliGenReader.h"
5c3fd7ea 40
a48e3376 41#include <TParticle.h>
693caace 42#include <TFile.h>
a48e3376 43#include <TTree.h>
44
5c3fd7ea 45
198bb1c7 46ClassImp(AliGenExtFile)
380956c5 47
48AliGenExtFile::AliGenExtFile()
1c56e311 49 :AliGenMC(),
50 fFileName(0),
51 fReader(0)
693caace 52{
f87cfe57 53// Constructor
693caace 54//
55// Read all particles
a48e3376 56 fNpart =- 1;
693caace 57}
58
59AliGenExtFile::AliGenExtFile(Int_t npart)
1c56e311 60 :AliGenMC(npart),
61 fFileName(0),
62 fReader(0)
693caace 63{
f87cfe57 64// Constructor
a48e3376 65 fName = "ExtFile";
66 fTitle = "Primaries from ext. File";
693caace 67}
68
69//____________________________________________________________
70AliGenExtFile::~AliGenExtFile()
71{
f87cfe57 72// Destructor
a48e3376 73 delete fReader;
693caace 74}
75
a48e3376 76//___________________________________________________________
77void AliGenExtFile::Init()
693caace 78{
a48e3376 79// Initialize
80 if (fReader) fReader->Init();
693caace 81}
82
a48e3376 83
693caace 84void AliGenExtFile::Generate()
85{
f87cfe57 86// Generate particles
693caace 87
eed0bb9a 88 Double_t polar[3] = {0,0,0};
693caace 89 //
eed0bb9a 90 Double_t origin[3] = {0,0,0};
1628e931 91 Double_t p[4];
693caace 92 Float_t random[6];
88cb7938 93 Int_t i = 0, j, nt;
693caace 94 //
4f23c932 95 //
96 if (fVertexSmear == kPerEvent) Vertex();
693caace 97
380956c5 98 while(1) {
99 Int_t nTracks = fReader->NextEvent();
100 if (nTracks == 0) {
101 // printf("\n No more events !!! !\n");
102 Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
693caace 103 return;
380956c5 104 }
105
106 //
107 // Particle selection loop
108 //
4f23c932 109 // The selection criterium for the external file generator is as follows:
380956c5 110 //
4f23c932 111 // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
380956c5 112 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
113 // fYMin, fYMax.
114 // If the particle does not satisfy these cuts, it is not put on the
115 // stack.
116 // 2) If fCutOnChild and some specific child is selected (e.g. if
117 // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
118 // child falls into the child-cuts.
88cb7938 119 TParticle* iparticle = 0x0;
120
380956c5 121 if(fCutOnChild) {
122 // Count the selected children
123 Int_t nSelected = 0;
4f23c932 124 while ((iparticle=fReader->NextParticle()) ) {
125 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
126 kf = TMath::Abs(kf);
127 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
128 nSelected++;
129 }
380956c5 130 }
131 if (!nSelected) continue; // No particle selected: Go to next event
132 fReader->RewindEvent();
133 }
a48e3376 134
380956c5 135 //
136 // Stack filling loop
137 //
7cf36cae 138 fNprimaries = 0;
380956c5 139 for (i = 0; i < nTracks; i++) {
ea79897e 140 TParticle* jparticle = fReader->NextParticle();
141 Bool_t selected = KinematicSelection(jparticle,0);
4f23c932 142 if (!selected) continue;
ea79897e 143 p[0] = jparticle->Px();
144 p[1] = jparticle->Py();
145 p[2] = jparticle->Pz();
1628e931 146 p[3] = jparticle->Energy();
147
b7a824ae 148 Int_t idpart = jparticle->GetPdgCode();
4f23c932 149 if(fVertexSmear==kPerTrack)
150 {
151 Rndm(random,6);
152 for (j = 0; j < 3; j++) {
153 origin[j]=fOrigin[j]+
154 fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
155 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
156 }
380956c5 157 } else {
ea79897e 158 origin[0] = fVertex[0] + jparticle->Vx();
159 origin[1] = fVertex[1] + jparticle->Vy();
160 origin[2] = fVertex[2] + jparticle->Vz();
380956c5 161 }
eed0bb9a 162 Double_t tof = jparticle->T();
8f126362 163 Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
ea79897e 164 Int_t parent = jparticle->GetFirstMother();
4f23c932 165
eed0bb9a 166 PushTrack(doTracking, parent, idpart,
167 p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], tof,
168 polar[0], polar[1], polar[2],
169 kPPrimary, nt, 1., jparticle->GetStatusCode());
170
4f23c932 171 KeepTrack(nt);
7cf36cae 172 fNprimaries++;
380956c5 173 } // track loop
0b05fbf9 174
175 // Generated event header
4f23c932 176
0b05fbf9 177 AliGenEventHeader * header = new AliGenEventHeader();
7cf36cae 178 header->SetNProduced(fNprimaries);
0b05fbf9 179 header->SetPrimaryVertex(fVertex);
7cf36cae 180 AddHeader(header);
380956c5 181 break;
4f23c932 182
380956c5 183 } // event loop
4f23c932 184
380956c5 185 SetHighWaterMark(nt);
2c354237 186 CdEventFile();
187}
380956c5 188
2c354237 189void AliGenExtFile::CdEventFile()
190{
191// CD back to the event file
33c3c91a 192 AliRunLoader::Instance()->CdGAFile();
693caace 193}
194
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693caace 196
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